| Micro motors play a significant role in various industrial equipment and act as a vital role in the power supply.Compared with normal motors,the permanent magnet brushed DC coreless motors as the micro motors are characterized by no iron core,low energy consumption,small size,lightweight,simple control and low cost of the commutator.The permanent magnet brushed DC coreless motors have a broad market in the fields of production,life and national defense.At present,hollow cup motors have been widely used in fields such as intelligent manufacturing,medical equipment,express shipping,military armor,space surveying and civil transportation.Inspired by the objective demands of enterprises and considers the background of engineering applications,aims at the permanent magnet brushed DC coreless motor suitable for lens focusing.The field-circuit combination method is used to couple theoretical analysis and model simulation analysis.At the same time,based on Ansys’ s multi-physics coupling to complete the entire process of motor design and simulation.Design a permanent magnet brushed DC coreless motor that meets the requirements of output indicators and multiphysics performance that is heat-resistant,strain-resistant and suitable for lens focusing.The whole research process is mainly divided into the following items.Firstly,explain the design process of the motor and determine the main technical indicators from the application scene and the precision manufacturing requirements,choose the field and magnetic circuit combination method as the motor design mode to determine the size and functional parameters of the main parts in the permanent magnet brushed DC coreless motor,simplify the equivalent analysis of the motor magnetic circuit,select the winding method.According to the effect of material properties in the magnetic field,the materials of each part are selected.Secondly,according to the preset motor parameters to set a plane model.Build the drive circuit to simulate the static magnetic field of the motor,the trajectory of the magnetic field line of the transient load and the transient no-load operation,air gap magnetic density distribution,output torque,opposing electromotive force and copper loss.Adjust the material,size and armature component span accordingly.As a supplement,analyze the data with graphs and tables.Verify and revise the electromagnetic parameters through the magnetic circuit calculation to improve the electromagnetic performance to ensure that the rated output function parameters are reached.Compared with the technical indicators,the rated output torque increased.Couple the analysis results of the electromagnetic field to the mechanical stress field and thermal field.Analyze the main force of the motor’s vibration strain and deformation essentially.Understand the heat exchange form of the motor from the contact mode of the heat source and other objects in space when the motor is running.Refer to the plane model to set a three-dimensional model.Then simulate the effect of strain,stress and heat exchange respectively and analyze the rationality of deformation and temperature rise to ensure that the motor is not easily deformed and can withstand normal operation at a high temperature of 75°C.Finally,analyze the winding method of the hollow cup armature.Different from the two-dimensional simulation that cannot highlight the hollow cup winding method,the performance of the hollow cup with different winding methods is analyzed and optimized in three dimensions.In the performance of multi-physics parameters,the design indicators and parameters are balanced.Compared with the common stacked winding,the heat loss reduced.This article shapes the specific motor structure,figures the theoretical source in the design and achieves the improvement of motor performance through principle analysis in the performance of multi-physics parameters.The rated output torque has been improved,and the heat loss has been reduced to a certain extent.It has certain practical value as the motor for camera lens focusing. |
